It all happened, this friday!
Tenchi Muyo! Ryo Ohki Dai-4-Ki official website added the foruth OAV in the Tenchi Muyo! Ryo Ohki OVA series!
New trailer is also out!
tenchi op trailer
The starting theme and ending song are both by Serena Kozuki.
Below is the main cast!
Masami Kikuchi as Tenchi Masaki
Ai Orikasa as Ryoko
Haruhi Nanao as Aeka Masaki Jurai
Chisa Yokoyama as Sasami Masaki Jurai 
Michie Tomizawa as Mihoshi Kuramitsui 
Yūko Kobayashi as Washu Hakubi 
Etsuko Kozakura as Ryo-Ohki 
Naomi Shindoh as Noike Kamiki Jurai 
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